--- /dev/null	2019-01-28 17:47:56.000000000 +0800
+++ new/src/share/vm/jfr/recorder/storage/jfrStorageUtils.hpp	2019-01-28 17:47:56.000000000 +0800
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_JFR_RECORDER_STORAGE_JFRSTORAGEUTILS_HPP
+#define SHARE_VM_JFR_RECORDER_STORAGE_JFRSTORAGEUTILS_HPP
+
+#include "jfr/recorder/storage/jfrBuffer.hpp"
+#include "jfr/recorder/repository/jfrChunkWriter.hpp"
+#include "jfr/utilities/jfrAllocation.hpp"
+#include "jfr/utilities/jfrTypes.hpp"
+#include "runtime/thread.hpp"
+
+template <typename Operation, typename NextOperation>
+class CompositeOperation {
+ private:
+  Operation* _op;
+  NextOperation* _next;
+ public:
+  CompositeOperation(Operation* op, NextOperation* next) : _op(op), _next(next) {
+    assert(_op != NULL, "invariant");
+  }
+  typedef typename Operation::Type Type;
+  bool process(Type* t = NULL) {
+    return _next == NULL ? _op->process(t) : _op->process(t) && _next->process(t);
+  }
+  size_t processed() const {
+    return _next == NULL ? _op->processed() : _op->processed() + _next->processed();
+  }
+};
+
+template <typename T>
+class UnBufferedWriteToChunk {
+ private:
+  JfrChunkWriter& _writer;
+  size_t _processed;
+ public:
+  typedef T Type;
+  UnBufferedWriteToChunk(JfrChunkWriter& writer) : _writer(writer), _processed(0) {}
+  bool write(Type* t, const u1* data, size_t size);
+  size_t processed() { return _processed; }
+};
+
+template <typename T>
+class DefaultDiscarder {
+ private:
+  size_t _processed;
+ public:
+  typedef T Type;
+  DefaultDiscarder() : _processed() {}
+  bool discard(Type* t, const u1* data, size_t size);
+  size_t processed() const { return _processed; }
+};
+
+template <typename Operation>
+class ConcurrentWriteOp {
+ private:
+  Operation& _operation;
+ public:
+  typedef typename Operation::Type Type;
+  ConcurrentWriteOp(Operation& operation) : _operation(operation) {}
+  bool process(Type* t);
+  size_t processed() const { return _operation.processed(); }
+};
+
+template <typename Operation>
+class MutexedWriteOp {
+ private:
+  Operation& _operation;
+ public:
+  typedef typename Operation::Type Type;
+  MutexedWriteOp(Operation& operation) : _operation(operation) {}
+  bool process(Type* t);
+  size_t processed() const { return _operation.processed(); }
+};
+
+enum jfr_operation_mode {
+  mutexed = 1,
+  concurrent
+};
+
+template <typename Operation>
+class DiscardOp {
+ private:
+  Operation _operation;
+  jfr_operation_mode _mode;
+ public:
+  typedef typename Operation::Type Type;
+  DiscardOp(jfr_operation_mode mode = concurrent) : _operation(), _mode(mode) {}
+  bool process(Type* t);
+  size_t processed() const { return _operation.processed(); }
+};
+
+#endif // SHARE_VM_JFR_RECORDER_STORAGE_JFRSTORAGEUTILS_HPP